H_2-CO还原钛精粉的热重法试验  

Experiment on H_2-CO Reduction of Titanium Concentrate by Thermogravimetry

作　　者：司新国 赵二敏 

机构地区：[1]河北钢铁集团唐钢公司,河北唐山063020

出　　处：《钢铁》2014年第1期85-90,共6页Iron and Steel

摘　　要：采用热重分析法研究了H2-CO还原钛精粉的特征。热重、相组成和形貌分析表明:在纯H2基础上,配加CO还原钛精粉的热重曲线具有相似性,即质量分数首先随时间的延长而下降,达到平衡后维持一定时间,随后逐渐增加;在质量分数降低的过程中,失重率随H2含量的增加而增加;相反,在质量分数增加的过程中,增重率首先随CO含量的减小而增加,至80%CO时达到最大值,而后逐渐减小。要保证还原产物中铁元素主要以金属相、非渗碳体相形式存在的合理温度是1150℃;开始阶段由于氢气原子半径小、扩散能力强,H2含量高时,产物表面孔隙较多,利于气体传输,还原能力强,随后由于渗碳体参与还原反应,产生大量气体,产物破碎程度增强,增加了其比表面积。It was studied that H2-CO reductive characteristics of titanium concentrate by thermogravimetry. After analysis of TG, phase and micro-topography, the results show that it is similar that TG curve of reduction of titanium concentrate on the basis of hydrogen with adding carbon monoxide. Firstly weight percents decrease with prolonging of time, then keep balanced for some time, finally increase gradually; weight loss ratio increases with adding of hydrogen content in the process of minishing the weight percent; if weight percentage keeps augmentative, rate of live weight growth enhances and maximizes on the condition of 80% carbon monoxide, then decreases gradually with lowing carbon monoxide content; reasonable temperature should be 1150℃ in order to ensure that there is not FexC phase and iron metal phase at a minimum platform; it holds strong diffusivity because hydrogen atomic radius is less; they accelerate the formation of porosity and strengthen vapor transport and reducing capacity in the beginning; reductive reaction happens between FexC and others with gas producing, which make oxidation product cataclastic and specific surface area becomes bigger.

关 键 词：氢气 一氧化碳 钛精粉 热重分析法 

分 类 号：TF823[冶金工程—有色金属冶金]